diff --git a/bootstrap.sh b/bootstrap.sh
index 7c590a3..4ac1429 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,3 +1,5 @@
 #!/bin/sh
 
+# Some versions of aclocal fail if m4/ doesn't exist
+mkdir -p m4
 autoreconf -i